Rewrite the static analyzer changes description for the 3.4 release.

After chatting with Anna Zaks, she believes that my code samples were
more bugs in the previous releases of the static analyzer.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_34@197377 91177308-0d34-0410-b5e6-96231b3b80d8